Get the current position

Use getCurrentPosition() to request one location result, then handle success, failure, and options separately.

What you will learn

What the three arguments mean
How to handle permission and device errors
How options affect the request

navigator.geolocation.getCurrentPosition(
  successCallback,
  errorCallback,
  options
);

successCallback: Required. Receives a Position object when the request succeeds.
errorCallback: Optional. Receives a GeolocationPositionError when the request fails.
options: Optional settings such as high accuracy, timeout, and cached-result age.

Handle errors

function showError(error) {
  if (error.code === error.PERMISSION_DENIED) {
    console.log('Location permission was denied.');
  } else {
    console.log('The position could not be read.');
  }
}

Location is sensitive information. Explain why your page needs it, request it at a useful moment, and do not treat a denied request as an exceptional user mistake.